Hello all, just seeking for some advice, as I have a chinese T4 78mm crank and case etc I decided to do a stroker with some bigger pistons like 103? question is, I see the crank has 55mm rod journals and the wide is also T1, so definately a T1 style rod, what should i search for to mate the existing parts on the market? I mean is there any choice on 100+ mm pistons with 22 pin, or could I work on the rods to make 24mm from 22 etc, I ask as I dont have anything yet, I have to buy, also dont know which is the max length for T1 rod we can find on the market, do you have any suggestions?
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Dimitrios
T4 chinese crank
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MegaRookie
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Re: T4 chinese crank
Hi Dimitros,
AA has piston/cylinder kits with 22mm pins up to 104mm. Regarding the rod length, I cannot advise you anything about that. It will really depend on what cylinder length you choose (AA also sells pistons for stroker engines and long cylinders). Maybe you can ask them for advise?
Enjoy the project.
Kind regards Mark
AA has piston/cylinder kits with 22mm pins up to 104mm. Regarding the rod length, I cannot advise you anything about that. It will really depend on what cylinder length you choose (AA also sells pistons for stroker engines and long cylinders). Maybe you can ask them for advise?
Enjoy the project.
Kind regards Mark
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SCARAB
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Re: T4 chinese crank
Hello Mark, thanks a lot for input, I made a search and I saw them too, I keep this in mind and try to search in another way, I have a local dealer of wiseco, I have contacted him and wait to give me a list, was thinking of some kind of harley? anyway aircooled version pistons in the region of 102-105 if such think exists, and deutz cylinders, their std measures are 100 and 102mm, cheap enough and I can work on them, anyway I'll write down if I find anything
Other thing is if this carnk is good enough to use as is, I beleive is an AA as its 78mm and T1 rod journal, couldnt find another except AA, I'm refering to the way the journals are drilled, chamferred etc, at first glance the drilling seems narrower? or is it because of the chamfer being smaller, if you have any experience with those cranks just let me know please
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Dimitrios
Other thing is if this carnk is good enough to use as is, I beleive is an AA as its 78mm and T1 rod journal, couldnt find another except AA, I'm refering to the way the journals are drilled, chamferred etc, at first glance the drilling seems narrower? or is it because of the chamfer being smaller, if you have any experience with those cranks just let me know please
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Dimitrios
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MegaRookie
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Re: T4 chinese crank
Hello Dimitrios,
The only experience with these parts I have so far is the build of my own engine, and it is not running yet, so cannot help you with that. What I can say is that the holes lined up nicely with the bearings, so didn't do much about that, but it really needed to be balanced.
As far of the 78mm stoke with type 1 journals you are coming close to problems regarding cam/rod clearance. I don't know what camshaft you want to run? (Ps. If you simply look at it you would have the same clearance as a 78+5=83mm stroke crank with 2.0l rods (50mm). So you can better take a look at rods with 5/16" bolts. And if you want high cam lift you should keep in mind that you might need to have a reduced base circle cam.)
With my 86mm stroke crank (with 2.0l journals) I could just get away with 5.7" rods (5/16") bolts in combination with a web 86c at 1" base circle after more then a bit of machining the rods to clear.
I like your idea of using Deutz cilinders. I also got a few kits of them, but never started with it due to the amount of work. Keep us updated about the choice of pistons and what the other specs will be.
Mark
The only experience with these parts I have so far is the build of my own engine, and it is not running yet, so cannot help you with that. What I can say is that the holes lined up nicely with the bearings, so didn't do much about that, but it really needed to be balanced.
As far of the 78mm stoke with type 1 journals you are coming close to problems regarding cam/rod clearance. I don't know what camshaft you want to run? (Ps. If you simply look at it you would have the same clearance as a 78+5=83mm stroke crank with 2.0l rods (50mm). So you can better take a look at rods with 5/16" bolts. And if you want high cam lift you should keep in mind that you might need to have a reduced base circle cam.)
With my 86mm stroke crank (with 2.0l journals) I could just get away with 5.7" rods (5/16") bolts in combination with a web 86c at 1" base circle after more then a bit of machining the rods to clear.
I like your idea of using Deutz cilinders. I also got a few kits of them, but never started with it due to the amount of work. Keep us updated about the choice of pistons and what the other specs will be.
Mark
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SCARAB
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- Joined: Tue Oct 23, 2018 10:57 am
Re: T4 chinese crank
Hello Mark, thanks a lot for the info, good to hear that at least the oil paths are aligned, I dont really like the chamfers but that\s another ting for later on the search, balancing is done in any engine so not actually an issue
about the cam shaft clearancing, I thought there should be a problem, now you mention it I'm prepared to have this addressed also, about the total throw actually is 78+2,5mm at one side of circle, Ill have to check with some H beam 3/8 rods to see how we clear, then we see
what I have so far about the crank, make me impression is really heavy, didnt measured it but I think is considerably heavier than other units
I think from a first measurement that the width of the conrod journal is at the big side, I'll have to check again and start from here as this can be a major problem, maybe even this was the issue of it and the carnk was sold to me, will check and double check
I may have found a piston, wait to put hands on it to check it live, 22mm pin, 102mm, flat top, no offset, narrow rings, and very small comp height like 26-27mm something, which is good maybe to help us with the rod length, as soon as I have something more specific I'll put it here
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Dimitrios
about the cam shaft clearancing, I thought there should be a problem, now you mention it I'm prepared to have this addressed also, about the total throw actually is 78+2,5mm at one side of circle, Ill have to check with some H beam 3/8 rods to see how we clear, then we see
what I have so far about the crank, make me impression is really heavy, didnt measured it but I think is considerably heavier than other units
I think from a first measurement that the width of the conrod journal is at the big side, I'll have to check again and start from here as this can be a major problem, maybe even this was the issue of it and the carnk was sold to me, will check and double check
I may have found a piston, wait to put hands on it to check it live, 22mm pin, 102mm, flat top, no offset, narrow rings, and very small comp height like 26-27mm something, which is good maybe to help us with the rod length, as soon as I have something more specific I'll put it here
Friendly
Dimitrios